Dental-cement injector.



:UNITED STA-res ,HENRY L. CRUTTENDEN, OF NORTHFIELD MINNESO'IA.L`

DENTAL-CEM ENT INJECTO'R.

SPECIFICATION forming part of Letters Patent No. 716,676, dated December 23,

application tied october ze. 1900. serai No. 34,405. maman.)

To all wiz/om, it may concern:

Be it known that I, HENRY L. CRUTTENDEN, a citizen of the UnitedStates, residing at Northfield, in the county of Rice and State of Minnesota, have invented certain new and useful Improvements in Dental-Cement Injectors; and I do hereby declare the fellowing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My present invention has for its object to provide a simple and efficient device for injecting cement or other plastic material into the roots of teeth in setting crowns and bridgework; and to this end it consists of the novel devices and combinationsof devices hereinafter described, and defined in the claims.

The invention is illustrated in the accompanying drawings, wherein like characters indicate like parts throughout the several views.

Figure l is a plan view of a collapsible cement-containing tube. Fig. 2 is a longitudinal section taken on the line m2 m2 of Fig. l. Fig. 3 is a plan view showing a pair of dental pliers of novel construction and one of the cement-tubes in position to be acted upon by the pliers. Fig. 4 is a view corresponding to Fig. 3, but showing the pliers moved so as to seal the larger end of the tube. Fig. 5 is a view corresponding to Figs. 3 and 4, but showing the jaws with pliers closed and the cement-tube completely flattened out; and Fig. 6 is a view in side elevation showing the members of the pliers as pulled apart laterally.

The numeral l indicates the cement-tube, which is open at one end and is formed at its other end with a contracted and attenuated or capillary discharge-nipple 2,through which the cement is ejected. The discharge-nipple 2 should be long enough to reach to the bottom of the cavity or canal of the root into which cement is to be'injected, thereby mal;- iug it possible to completely ll the entire cavity or canal with material Without air being confined in any portion thereof. The cement (indicated ate in Fig. 2) is placed within the tube 1 through its `larger end. YThis tube may be formed either of metal or of tough paper, but in all cases must be made of material which may be easily collapsed and pressed together, so as to eject the cement through the small nipple 2, as hereinafter illustrated.

The pliers used in connection with the tube are of special construction, designed with relation to the size and nature of the said tube, and it comprises a pair of levers or members c b, pivotally connected at c by astud which projects from the member a and Works through a suitable seat formed in the member b. The members a and b are respectively forrned with feet a. and b', the former of which is provided with a laterally-projecting flange a2, the upper face of which affords a pressing-surface for cooperation with the lower pressing-surface of the foot b. These pressing-surfaces of the feet d and b' extend tangentally to the same or approximately the same imaginary circle struck from the axis of the pivot-pin c. The footb is formed with a heel b2 and with a stop-lug b3. The corner edge of the heel b2 is located distant from thel axis of the pivot-stud c approximately the radius of the said imaginary circle, so that when the lever b is moved into the position indicated in Fig. 4 the corner of the said heel will be pressed closely to the pressing-surface of the ange a2 of the foot a'. When, however, the lever b is turned into the position indicated in Fig. 8, the heel b2 will be raised above the iange 0.2 far enough to permit the large end of the tube l to be placed between the same' and the said flange, and the stop a serves to limit the inward movement of the cement-tube.

The use of the device is probably understood, but may be briefly summarized as follows: As the cement which is to form the lling hardens quickly, it must be placed within the tube 1 just before it is to be used. The filled tube is then located with respect to the pliers, as shown in Fig. 3. The levers of the pliers are Athen partially closed, substantially as indicated in Fig. 4, and by this movement the large open end of the tube lis sealed or tightly closed by being pressed between the heel'b2 and the `flange a2, as clearly shown in said Fig. 4. The discharge end of the capillary nipple 2 of the said tube is then placed in the cavity of the tooth or root.

IOO

The levers a, and b are then gradually forced from the relative positions indicated in Fig. 4 into the position indicated in Fig. 5, under which movement the closing action of the cooperating pressing-surfaces of the feet a and b' gradually and positively forces the cement from the tube through the nipple 2. When the cement has been entirely ejected,

' the sides of the tubes are pressed tightly together. The collapsed or attened tube is then thrown away, and for another filling or for another piece of work a new tube is employed. These tubes, whether made of paper, tin-foil, or Very light cheap metal, may be provided at a Very small cost.

The pincers themselves may be Very easily cleaned, and for this purpose they are separated by pulling the one laterally from the other, as shown in Fig. 6.

By actual usage I have demonstrated the efficiency of the device above described.

The collapsible tube independent of the tool I do not herein claim, as the same is broadly claimed in a divisional application filed May l2, 1902, Serial No. 106,879, entitled Collapsible dental-cement-injecting tube, which application was allowed June 13, 1902.

What I claim, and desire to secure by Letters Patent of the United States, is as follows:

l. A pair of dental pliers'comprising a pair of pivoted levers or members a b having, respectively, the feet a and b', said foot a having the laterally-projected flange a2 and said foot b having the heel b2, said parts operating substantially as described.

2. A pair of dental pliers comprising the pair of pivoted levers or members a, b, having, respectively, the feet a and b, said foot a having the laterally-projected ila-nge a2, and said foot b having the heel b2 and stoplug b3, said parts operating substantially as described.

3. A pair of dental pliers comprising the pair of detachable levers a, b, detachabl y connected by the pivot-stud c, said member a having the foot a with laterally-projected flange a2, and said lever b having the foot b with heel b2 and stop-Inglis, said parts operating substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

HENRY L. CRUTTENDEN.

Witnesses:

D. D. TURNER, L. L. ORR. 

